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4-Bolt Main 350s

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by RobbieOH, Mar 14, 2002.

  1. RobbieOH

    RobbieOH Registered Member

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    What years/models of chevy trucks/cars came with a 350 with 4-bolt mains?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    I don't think anyone has a comprehensive list. I'm working on something, but I don't have enough block/suffix numbers to conclusively prove that I'm right or not.

    But, http://yeagerd.home.mindspring.com/chevrolet.html shows you where the suffix codes are, and then how to tell a 2 or 4 bolt will list the ones that I HAVE info on so far.

    Again, not enough to be conclusive, but a little bit better than guessing.
     
  3. RobbieOH

    RobbieOH Registered Member

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    well, thanks for that, atleast it'll narrow it down a bit. I'll go looking and let ya knwo what I find
     
  4. Stomp

    Stomp 1/2 ton status

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    Usually, anything out of a 3/4 ton truck or van has a 4 bolt. Look for the larger damper and 4 bbl intake and its almost always a 4 bolt
     
  5. BigBoy truck

    BigBoy truck Registered Member

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    id say screw it and drop the oil pan and take a look
     
  6. twenty_below0

    twenty_below0 1/2 ton status

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    In all actuality if your not running over 450 h.p. then it doesn't matter if it's a 4 or 2 bolt block, actually most old school engine builders preferr a 2 bolt because they GIVE a little where the 4 bolt is more rigid and will spin a bearing, and if you build a real motor the best way to go is with a strapped 2 bolt or splayed 4 bolt caps line honed to the block for squareness, check out Mortec for more casting numbers etc.
     

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